In medium bowl, mix 1 cup of the flour, the granulated sugar, salt and yeast. Add milk, 2 tablespoons softened butter and the egg yolk. Beat with electric mixer on low speed 1 minute, scraping bowl frequently. Beat on medium speed 1 minute, scraping bowl frequently. Stir in enough remaining flour, ¼ cup at a time, to make dough easy to handle.

Place dough on lightly floured surface. Knead about 5 minutes or until dough is smooth and springy. Grease medium bowl with shortening. Place dough in bowl, turning dough to grease all sides. Cover bowl loosely with plastic wrap; let rise in warm place 1 hour to 1 hour 30 minutes or until dough has doubled in size. Dough is ready if indentation remains when touched.

Spray 8-inch square pan with cooking spray. In 1-quart saucepan, heat ½ cup brown sugar and ¼ cup softened butter to boiling, stirring constantly; remove from heat. Stir in corn syrup. Pour into pan.

In small bowl, mix ¼ cup brown sugar and ½ teaspoon cinnamon; set aside.

Gently push fist into dough to deflate. Flatten dough with hands or rolling pin into 8x10-inch rectangle on lightly floured surface. Spread with 2 tablespoons softened butter; sprinkle with cinnamon sugar. Roll rectangle up tightly, beginning at 8-inch side. Pinch edge of dough into roll to seal. With fingers, shape until even. With serrated knife, cut roll into 4 (2-inch) slices.

Place slices, cut sides up, slightly apart in pan. Cover loosely with plastic wrap; let rise in warm place 30 to 45 minutes or until dough has doubled in size.

Heat oven to 350°F. Bake 28 to 32 minutes or until golden brown. Let stand 2 minutes. Place heatproof tray or serving plate upside down onto pan; immediately turn tray and pan over. Let pan remain on top of rolls 1 minute so caramel can drizzle over rolls; remove pan. Serve warm.